2013

6.7

1972

6.9

2005

5.5

2003

6.5

1990

6.8

2002

4.8

2004

5.6

1987

7.3

1988

5.0

1996

6.6

2002

7.1

2001

6.7

2002

6.2

2007

5.6

1976

7.2

1991

7.1

2002

6.5

1987

5.7

1984

3.3

2002

3.9